<select name="{$comboName}" class="form-control" {$htmlAttr}>
    {notempty name="hasEmpty"}
    <option value="">--请选择--</option>
    {/notempty}
    {volist name="model" id="vo"}
        <option value="{$vo[$idField]}" {if condition="in_array($vo[$idField],$defaultValue)"}selected="selected"{/if}>{$vo[$titleField]}</option>
    {/volist}
</select>